ALOGE的定义包含路径

Android打工人

已于 2025-06-14 19:49:01 修改

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文章标签： linux 算法运维

于 2025-06-14 12:55:53 首次发布

本文链接：https://blog.youkuaiyun.com/weixin_42194738/article/details/148650723

首先文件： frameworks/base/cmds/app_process/app_main.cpp

包含了： #include <utils/Log.h>

并使用了ALOGE

69          char* slashClassName = toSlashClassName(mClassName.string());
70          mClass = env->FindClass(slashClassName);
71          if (mClass == NULL) {
72              ALOGE("ERROR: could not find class '%s'\n", mClassName.string());
73          }

第一步：全球搜索Log.h 命令 : locate Log.h |grep \/utils\/Log.h

......

/mnt/extdisk/8/system/core/libutils/include/utils/Log.h
/mnt/extdisk/9/system/core/libutils/include/utils/Log.h

......

第二步：

cat /mnt/extdisk/9/system/core/libutils/include/utils/Log.h
// DO NOT INCLUDE ANYTHING NEW IN THIS FILE.

// <log/log.h> has replaced this file and all changes should go there instead.
// This path remains strictly to include that header as there are thousands of
// references to <utils/Log.h> in the tree.

#include <log/log.h>
==============================================

可见这是个中间文件

第三步全球搜索log.h : locate log.h |grep \/log\/log.h

locate log.h |grep \/log\/log.h

4，查看log.h

这里面没有关于ALOGE的定义

test@home:/mnt/extdisk/9$

再确认里面包含的头文件是否有：同样的方法[

4.1 locate log.h |grep \/androd\/log.h
再找到android/log.h 如下：

/mnt/extdisk/9/out/soong/ndk/sysroot/usr/include/android/log.h
/mnt/extdisk/9/system/core/include/android/log.h
/mnt/extdisk/9/system/core/liblog/include/android/log.h

搜索无任何结果：

cat xx.txt
/mnt/extdisk/9/out/soong/ndk/sysroot/usr/include/android/log.h
/mnt/extdisk/9/system/core/include/android/log.h
/mnt/extdisk/9/system/core/liblog/include/android/log.h
test@home:/mnt/extdisk/9$
test@home:/mnt/extdisk/9$ cat xx.txt |xargs grep -rn ALOGE

test@home:/mnt/extdisk/9$

4.2 log_id.h

/mnt/extdisk/9/system/core/liblog/include/log/log_id.h
/mnt/extdisk/9/system/core/liblog/include_vndk/log/log_id.h

test@home:/mnt/extdisk/9$ grep -rn ALOGE /mnt/extdisk/9/system/core/liblog/include/log/log_id.h /mnt/extdisk/9/system/core/liblog/include_vndk/log/log_id.h
test@home:/mnt/extdisk/9$

没有：

4.3 log_main.h

test@home:/mnt/extdisk/9/system/core$ find -name log_main.h |xargs grep -rn ALOGE
./liblog/include/log/log_main.h:241:#ifndef ALOGE
./liblog/include/log/log_main.h:242:#define ALOGE(...) ((void)ALOG(LOG_ERROR, LOG_TAG, __VA_ARGS__))
./liblog/include/log/log_main.h:245:#ifndef ALOGE_IF
./liblog/include/log/log_main.h:246:#define ALOGE_IF(cond, ...) \
./liblog/include/log/log_main.h:293:#ifndef IF_ALOGE
./liblog/include/log/log_main.h:294:#define IF_ALOGE() IF_ALOG(LOG_ERROR, LOG_TAG)
./liblog/include_vndk/log/log_main.h:241:#ifndef ALOGE
./liblog/include_vndk/log/log_main.h:242:#define ALOGE(...) ((void)ALOG(LOG_ERROR, LOG_TAG, __VA_ARGS__))
./liblog/include_vndk/log/log_main.h:245:#ifndef ALOGE_IF
./liblog/include_vndk/log/log_main.h:246:#define ALOGE_IF(cond, ...) \
./liblog/include_vndk/log/log_main.h:293:#ifndef IF_ALOGE
./liblog/include_vndk/log/log_main.h:294:#define IF_ALOGE() IF_ALOG(LOG_ERROR, LOG_TAG)
test@home:/mnt/extdisk/9/system/core$

找到

68 /*
69 * Log macro that allows you to specify a number for the priority.
70 */
71 #ifndef LOG_PRI
72 #define LOG_PRI(priority, tag, ...) android_printLog(priority, tag, __VA_ARGS__)
73 #endif
74

62 #define android_printLog(prio, tag, ...) \
63 __android_log_print(prio, tag, __VA_ARGS__)
64

__android_log_print jni 中能直接使用的打印封装。

491 LIBLOG_ABI_PUBLIC int __android_log_print(int prio, const char* tag,
492 const char* fmt, ...) {
493 va_list ap;
494 char buf[LOG_BUF_SIZE];
495
496 va_start(ap, fmt);
497 vsnprintf(buf, LOG_BUF_SIZE, fmt, ap);
498 va_end(ap);
499
500 return __android_log_write(prio, tag, buf);
501 }
......
411 LIBLOG_ABI_PUBLIC int __android_log_write(int prio, const char* tag,
412 const char* msg) {
413 return __android_log_buf_write(LOG_ID_MAIN, prio, tag, msg);
414 }
415

416 LIBLOG_ABI_PUBLIC int __android_log_buf_write(int bufID, int prio,
417 const char* tag, const char* msg) {
418 struct iovec vec[3];
419 char tmp_tag[32];
420

477 vec[2].iov_len = strlen(msg) + 1;
478
479 return write_to_log(bufID, vec, 3);
480 }
481

write_to_log 是个函数指针：默认 = __write_to_log_init

40 static int (*write_to_log)(log_id_t, struct iovec* vec,
41 size_t nr) = __write_to_log_init;

system/core/liblog$ grep -rn "write_to_log = "
logger_write.c:144: write_to_log = __write_to_log_init;
logger_write.c:401: write_to_log = __write_to_log_daemon;
logger_write.c:680: write_to_log = __write_to_log_null;
logger_write.c:696: write_to_log = __write_to_log_init;
logger_write.c:700: write_to_log = __write_to_log_init;

385 static int __write_to_log_init(log_id_t log_id, struct iovec* vec, size_t nr) {
386 int ret, save_errno = errno;
387
388 __android_log_lock();
389
390 if (write_to_log == __write_to_log_init) {
391 ret = __write_to_log_initialize();
392 if (ret < 0) {
393 __android_log_unlock();
394 if (!list_empty(&__android_log_persist_write)) {
395 __write_to_log_daemon(log_id, vec, nr);
396 }
397 errno = save_errno;
398 return ret;
399 }
400
401 write_to_log = __write_to_log_daemon;
402 }
403
404 __android_log_unlock();
405
406 ret = write_to_log(log_id, vec, nr);
407 errno = save_errno;
408 return ret;

diff --git a/include/log/log_main.h b/include/log/log_main.h
index c88fe72..36b368a 100644
--- a/include/log/log_main.h
+++ b/include/log/log_main.h
@@ -298,6 +298,9 @@ __BEGIN_DECLS
 #endif

 /* --------------------------------------------------------------------- */
+#ifndef ALOGX
+#define ALOGX(fmt, ...) __android_log_print(ANDROID_LOG_DEBUG, LOG_TAG, "%s +%d %s msg --> " fmt, __FILE__, __LINE__, __func__, ##__VA_ARGS__)
+#endif

 /*
  * Basic log message macro.

01-01 08:00:05.950 1881 1881 D appproc : frameworks/base/cmds/app_process/app_main.cpp +284 main msg --> -----------nice name = zygote
01-01 08:00:05.951 1902 1902 I android.hardware.tv.cec@1.0-service: Registration complete for android.hardware.tv.cec@1.0::IHdmiCec/default.
01-01 08:00:05.952 1881 1881 D appproc : frameworks/base/cmds/app_process/app_main.cpp +324 main msg --> >We're in zygote mode.
01-01 08:00:05.953 1881 1881 D appproc : frameworks/base/cmds/app_process/app_main.cpp +352 main msg --> zygote == true to start java clz: com.android.internal.os.ZygoteInit.